[jira] Updated: (DERBY-609) Returning ByteArrayInputStream from ResultSet is not appropriate

["Tomohito Nakayama (JIRA)" <de...@db.apache.org>]

     [ http://issues.apache.org/jira/browse/DERBY-609?page=all ]

Tomohito Nakayama updated DERBY-609:
------------------------------------

      Component: Network Client
        Summary: Returning ByteArrayInputStream from ResultSet is not appropriate  (was: Returning ByteArrayInputStream from ResultSet is not ?)
    Description: 
Point where it is not appropriate :


1: Compatibility

The InputStream returned from result set is closed when other getXXXX method was called .
http://java.sun.com/j2se/1.5.0/docs/api/java/sql/ResultSet.html

However closing ByteArrayInputStream have no effect at all .
http://java.sun.com/j2se/1.5.0/docs/api/java/io/ByteArrayInputStream.html#close()

It seems intended that closable InputStream was returned from result set .
If ByteArrayInputStream was returned from result set , the stream cannot be closed, 
and compatibility would be lost .


2: Performance of program 
Information inputted from ByteArrayInputStream needs to be expanded to memory as byte[] object .

If large byte[] object was created for each ByteArrayInputStream object , 
program will run in bad performance .

// I think problem is when information typed as LOB was retrieved from ResultSet .
// Because such informations typed as LOB tend to be large amount .

  was:


I misoperated and there was no description in this issue.

> Returning ByteArrayInputStream from ResultSet is not appropriate
> ----------------------------------------------------------------
>
>          Key: DERBY-609
>          URL: http://issues.apache.org/jira/browse/DERBY-609
>      Project: Derby
>         Type: Bug
>   Components: Network Client
>     Reporter: Tomohito Nakayama

>
> Point where it is not appropriate :
> 1: Compatibility
> The InputStream returned from result set is closed when other getXXXX method was called .
> http://java.sun.com/j2se/1.5.0/docs/api/java/sql/ResultSet.html
> However closing ByteArrayInputStream have no effect at all .
> http://java.sun.com/j2se/1.5.0/docs/api/java/io/ByteArrayInputStream.html#close()
> It seems intended that closable InputStream was returned from result set .
> If ByteArrayInputStream was returned from result set , the stream cannot be closed, 
> and compatibility would be lost .
> 2: Performance of program 
> Information inputted from ByteArrayInputStream needs to be expanded to memory as byte[] object .
> If large byte[] object was created for each ByteArrayInputStream object , 
> program will run in bad performance .
> // I think problem is when information typed as LOB was retrieved from ResultSet .
> // Because such informations typed as LOB tend to be large amount .

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